year  wymidx-sep
1948   1.767
1949   1.235
1950   1.270
1951  -0.548
1952   0.724
1953   0.848
1954   2.200
1955   0.575
1956   1.349
1957   0.034
1958   1.842
1959   0.860
1960   1.271
1961   2.309
1962   0.475
1963  -0.199
1964   1.592
1965  -0.092
1966  -0.567
1967   0.774
1968  -0.108
1969  -0.697
1970   0.665
1971  -0.077
1972  -2.730
1973   0.585
1974  -1.003
1975   0.207
1976  -0.892
1977  -1.024
1978   0.308
1979  -1.447
1980  -0.246
1981   0.205
1982  -0.629
1983   0.402
1984  -1.218
1985   0.032
1986  -0.847
1987  -1.412
1988   0.114
1989  -0.407
1990   0.088
1991  -0.504
1992  -0.195
1993   0.330
1994  -1.409
1995  -0.102
1996  -0.135
1997  -2.380
1998   0.459
1999   0.116
2000  -0.881
2001  -0.583
2002  -1.294
2003  -0.100
2004  -0.965
2005   0.372
2006  -0.575
2007   0.164
2008   0.093